Updated February 22, 2017 at 4:30 PM;Posted February 22, 2017 at 1:58 PM

Twistars - Dr. Larry Nassar

The Dimondale location for Twistars Gymnastics Club. Dr. Larry Nassar volunteered with the organization and was also recommended to gymnasts by Twistars officials for treatments.
(Lauren Gibbons | MLive)

It was "common knowledge" at Twistars gymnastics club in Dimondale that Dr. Larry Nassar vaginally penetrated teenage girls while treating them for sports injuries, according to three alleged victims in a court document filed Wednesday, Feb. 22.

The women's allegations are included in an affidavit filed this morning in Eaton County District Court by Detective Sgt. Andrea Munford of the Michigan State University Police.

Based on the affidavit, the court authorized seven charges of first-degree criminal sexual assault involving incidents that allegedly occurred at Twistars.

Those charges are in addition to the 15 counts of first-degree CSC filed against Nassar in Ingham County today.

The three alleged Eaton County victims told investigators they were sexually abused under the guise of medical treatment while training at Twistars, a nationally acclaimed gymnastics club.

Twistars' owner, John Geddert, coached the U.S. gymnastics team at the 2012 Olympics. Someone who answered the phone at Twistars Wednesday afternoon said Geddert was not available for comment, and no one else could comment on the allegations.

Nassar was the facility's physician, working with gymnasts there for more than 20 years. According to the court affidavit, Nassar routinely came to Twistars on Monday nights to work with gymnasts.

Those treatments included vaginal and anal penetration that authorities are alleging was sexual assault, according to the affidavit.

All three victims, who were minors when alleged abuse occurred, said that Nassar did not use gloves or seek consent from them or their parents for the treatments, according to the affidavit.

A 16-year-old identified in the affidavit as Victim A said she was assaulted at least three times at Twistars, including when she was under age 13, the affidavit said.

"Victim A stated she and other gymnasts would talk about Nassar," the affidavit said. "They would discuss how he was 'touchy.' At the time, the victim did not question Nassar because he was doing the same thing to other gymnasts she knew. Victim A stated that because she was so young, she really didn't know anything was wrong."

Victim B, who is now 21, told authorities she was assaulted by Nassar "more times than she could count" in a back room at Twistars, starting when she was 15 years old, according to the affidavit.

"At the time it was occurring, Victim B and a few of her teammates began talking about their experiences with Nassar and they realized they were all being penetrated by him during their appointments," the affidavit said. "Because it was happening to all of them, they thought it was normal."

Victim C, who is now 22, was a Nassar patient from the age of 14 until 17 while she was a gymnast at Twistars, the affidavit said.

She alleges that Nassar told her: "We don't tell parents about this because they wouldn't understand" in regards to the vaginal penetration.

"Victim C states it was common knowledge among the gymnasts that Nassar was vaginally penetrating gymnasts," the affidavit said. "However, no one questioned Nassar because of his position and reputation."

In addition to the cases involving Twistars, 15 charges of first-degree criminal sexual conduct were filed Wednesday in Ingham County's 55th District Court for cases involving seven women alleging abused by Nassar at MSU's sports-medicine clinic and at his home in Holt, where he sometimes saw patients.

Attorney General Bill Schuette and the head of the Michigan State University Police Department are holding a 2:30 p.m. press conference to discuss the new charges.

Before he was fired in September, Nassar was an acclaimed MSU sports-medicine doctor who also served as team physician for U.S. gymnasts at four Olympic games.

In September, two of his former patients -- including an Olympic medalist -- went public with accusations that they were sexually abused by Nassar under the guise of medical treatment that involved digital penetration of their vaginas.

Since then, more than 50 women have filed criminal complaints and at least 44 women have filed lawsuits alleged by they were abused by Nassar.

Nassar already has been charged with three counts of first-degree criminal sexual conduct in relation to a non-patient under 13 he allegedly assaulted. He is also facing federal child pornography possession charges.

A preliminary hearing was held Friday in the CSC case, and a district court judge ruled there were sufficient evidence to send the case to circuit court.